Endless Sphere

The cores for this motor are designed, but the problem I'm having right now is that this DSM program I'm using only exports in STL, which is a 3D printer format. CNC machines use 'solid' format's like STEP, and IGES. S I don't understand, aren't you using Fusion 360? It can export in STEP, no probl...

The fans push a significant amount of cooling and they are dead silent. I'll monitor the setup and if they ultimately don't provide value I can try water cooling. Up to you , but if you want the fans to be useful, at least make them blow towards the bottom plate of the aluminum casing, that's where...

I have been thinking about it though. (end windings) This is one half baked idea I've been trying to work out,..sort of a radiator style core. End turns get reduced, and radial turns are doubled. I'm not sure how the magnetics would wind up being yet, and I'm probably missing something major, but I...

Any luck on the APT software @Dui? It would be awesome to dive into the APT configurations. Sorry I totally forgot. I asked him right now so I'll tell you once I get the reply. Sorry to say that, but fans you installed won't serve much purpose. The orange part of the cover isn't the one you want to...

Maybe you could consider using screws made of FR4 material (the kind of plastic used for electronic boards). They will resist the heat cycles and this is a very tough plastic with very high insulation characteristics. I think it might work, but can't be really sure, there are lots of forces involved...

There is alot more than just the V=IR of battery's internal resistance. Alot more. You pay attention to one "Law" like it matters when you ignore (10) other "laws"... No you didnt invent the math, you just didnt use it to its complete ability. Okay, maybe. I'd just appreciate for you to explain, fo...

Do you think the 400a will be a better choice than the 300a? I don't think it will matter all that much in your case since your controller is rated at 150A battery. So unless you change for some beefier controller later 300A will be more than you'll ever need. But if the price difference is not too...

Yeah the math is not correct. It would be more useful to explain why and what should be the correct way. I'm thinking someting isn't right with this math since if u got 4 example 100ohm it will be: 0.100 * 50A = 5V which is more then 100% of cell voltage so it's doesn't make too much sense. I didn'...

Let's take a "normal cell: If my math and method are correct: -0.003 ohm x 50Amps = 0.15V So that means this cell, whenever you are pulling 50Amps from it, will sag of 0.15V. If your cell fully charged was about 4.0V, under full 50Amps load the cell voltage will be 4.0 - 0.15 = 3.85V, so it's good. ...

So yeah, as the others pointed out, the problem comes from your battery. Your controller is an APT72400, which is a very nice unit, APT being one of the best chinese brands actually. It is rated at 150A battery and 400A/phase, which isn't bad but it is a tiny bit underpowered for this machine, still...

That's weird. With this voltage and this wheel diameter, your moped should reach around 75-80 km/h. I think there is something wrong in the way you've set up your controller. Please post some screenshots of all the different tabs you see in the controller interface so we can help you diagnose what's...

If it doesn't charge or doesn't do anything when connected on the bike, then I doubt a multimeter will give you any useful information anyway. It will either read zero volt or some floating voltage, nothing really useful. Still, it's a nice and cheap tool to have so you should definitely get one, bu...

That's good progress, can't wait to see it finished!
What kind of power/torque figures do you expect to get from this motor if everything goes well ?

I didn't know about aftermarket digital read outs for a lathe, so I checked a few of them out. That would be great, I especially like the zeroing feature, to reset at any point. It would be kind of a waste on this little first gen. 9" lathe,.. although I could always transfer it over to the next la...

I am not trying to start a fight here, I just try to understand what a gearbox brings to the table. I guess everyone has a different point of view when it comes to riding fun. In Europe most people have manual gearboxes for cars and automatic gearboxes are the exception. It's not that we can't buil...

Keeping the gearbox is, in my opinion, a good idea. This way you can maximize the torque on the wheel, maximize your top speed and, possibly, optimize your cruise speed efficiency by avoiding using flux weakening. It will also be funnier to drive, that's something most people seem to forgot somehow....

Good luck with Mobipus.... Their password system is a huge pain. I can't remember for sure what were the passwords. Something like "Mobipus" was unlocking the "user Mode" (whatever that was, not sure it will be enough for you but as I recall you would be able to set a few parameters, like throttle, ...

Great work, it starts lookin' good!! Can't wait to see the first real parts getting together and this beast running! Kudos on your learning curve by the way, 3D design is not easy at first but it seems you got the basics pretty quick! Not sure how you designed it but you shouldn't have a problem wit...

9KW electric is not really comparable with 9KW gas powered. The torque is much greater with an electric motor, so you can get away with far less than this. Don't go for a 8KW motor on this thing, that's completely ridiculous, you will never be able to supply it with enough power (or if you can, then...

@APL my two cents: don't spend too much time on the cooling fans theory. I'm not sure yet which design you are settling on for your motor, but if it is anything similar to your previous one, then I suggest you to consider the following option: 3D print some covers. This way, you could very easily ex...

Might be a few millimeters though, now that I look at it. Should be enough? Yeah that should work fine. What you want is a bit of air flow, primary goal is to use energy to get the bike moving, not making a gigantic fan ;-) Air has a very low viscosity so it will find its way between any tiny gaps ...

Don't want to beat it to death, so I'll edge it back over to motors for a while. I found this 2015 article on an 18/16 axial thats similar to this motor, in that it uses straight through cores and double windings. Looks a lot like Dui ni shuo de dui's graphics a few pages back with the center pegs....

Finally have a line on a new (refurbished) PC, but the acquisition is taking time. Tower, new OS, and nice big monitor. :) One of the loose ends on the new motor is the spacer design. The last motor had spacers that were unidirectional, but thats not really necessary, and although they looked nice,...

Here in China removable batteries are a very common thing and most people live with it without any problem. Some people even have removable lead acid batteries... So if in your case it's lithium batteries, then it's not really heavy. Perfectly fine to live with it unless maybe if you're extremely la...

Well, I'm not so sure Onshape is free anymore,.. free company tutorials, or free for $1500. a year, or maybe a free trial after they call you up on the phone, and give you the business. I just spent all night trying to get a free hobbyist account, but had no luck. If it's still available, then they...